PREDICTION OF BLAST LOADING AND ITS IMPACT ON THE STIFFENED DOOR STRUCTURE
An unexpected bomb explosion within or in the near vicinity of a commercial or military structures can cause severe damage on the building's external and internal structural frames. Generally, these external structures can be strengthened using reinforced concrete walls. However, the entrances cannot be completely sealed off under consideration of free pass. Thus, a variety of blast resistant doors that withstand explosion impact were designed for various applications. Such a blast resistant door could be constructed as stiffened steel plate. The objective of this paper is to study the extent of damage that can be caused due to a blast load on stiffened steel plate designed to withstand blast load using computational methods. In this paper, panels with different stiffeners are considered for numerical study. Two types of stiffeners, T and HAT shaped stiffeners are considered. The thickness of these stiffeners is varied to study the effect of damage caused due to blast load. Special emphasis is focused on evaluation of mid-point displacements and strain energy. The finite element package ABAQUS is used for modeling the plate, with two different stiffeners separately having constant height and different thickness. The boundary conditions are assumed to be fixed on all sides and meshed using the S4R type shell element. For the response calculations, a fixed blast load is applied in all the cases of the stiffened steel plate of the door structure considered. The blast response of stiffened blast doors with two different stiffeners subjected to constant blast load was examined. The present analysis gives a comprehensive insight into the effects of explosion on blast door structures. The results of blast load analysis for stress, mid-point displacements and strain energy for T and HAT stiffeners were compared against each other and found that HAT stiffener performs better.